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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-146
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Jun 2018

Research article | 04 Jun 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Building the COllaborative Carbon Column Observing Network (COCCON): Long term stability and ensemble performance of the EM27/SUN Fourier transform spectrometer

Matthias Frey1, Mahesh Kumar Sha2,a, Frank Hase1, Matthäus Kiel3,a, Thomas Blumenstock1, Roland Harig4, Gregor Surawicz4, Nicholas M. Deutscher5, Kei Shiomi6, Jonathan Franklin7, Hartmut Bösch8,9, Jia Chen10, Michel Grutter11, Hirofumi Ohyama12, Youwen Sun13, André Butz14,b, Gizaw Mengistu Tsidu15, Dragos Ene16, Debra Wunch17, Zhensong Cao13, Omaira Garcia18, Michel Ramonet19, Felix Vogel20, and Johannes Orphal1 Matthias Frey et al.
  • 1Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany
  • 2Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
  • 3Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
  • 4Bruker Optics GmbH, Ettlingen, Germany
  • 5Centre for Atmospheric Chemistry, School of Chemistry, University of Wollongong, Wollongong, Australia
  • 6Japan Aerospace Exploration Agency, Tsukuba, Japan
  • 7Harvard University, Cambridge, USA
  • 8Department of Physics and Astronomy, University of Leicester, UK
  • 9National Centre for Earth Observation (NCEO), University of Leicester, UK
  • 10Technische Universität München, Munich, Germany
  • 11Universidad National Autonoma de Mexico, Mexico City, Mexico
  • 12National institute for Environmental Studies, Tsukuba, Japan
  • 13Anhui Institute of Optics and Fine Mechanics, Hefei, China
  • 14Institut für Umweltphysik, Universität Heidelberg, Germany
  • 15Botswana International University of Science and Technology, Gaborone, Botswana
  • 16National Institute for Research and Development in Optoelectronics, Magurele, Romania
  • 17University of Toronto, Toronto, Canada
  • 18Izaña Atmospheric Research Centre (IARC), Meteorological State Agency of Spain (AEMET), Tenerife, Spain
  • 19Laboratoire des sciences du climat et de l’environment, Gif-Sur-Yvette, France
  • 20Environment Canada, Toronto, Canada
  • apreviously at: Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany
  • bpreviously at: Institut für Physik der Atmosphäre,Deutsches Zentrum für Luft- und Raumfahrt e. V., Oberpfaffenhofen, Germany

Abstract. In a 3.5 year long study, the long term performance of a mobile Bruker EM27/SUN spectrometer, used for greenhouse gases observations, is checked with respect to a co-located reference Bruker IFS 125HR spectrometer, which is part of the Total Carbon Column Observing Network (TCCON). We find that the EM27/SUN is stable on timescales of several years, qualifying it as an useful supplement for the existing TCCON network in remote areas. For achieving consistent performance, such an extension requires careful testing of any spectrometers involved by application of common quality assurance measures. One major aim of the COllaborative Carbon Column Observing Network (COCCON) infrastructure is to provide these services to all EM27/SUN operators. In the framework of COCCON development, the performance of an ensemble of 30 EM27/SUN spectrometers was tested and found to be very uniform, enhanced by the centralized inspection performed at the Karlsruhe Institute of Technology prior to deployment. Taking into account measured instrumental line shape parameters for each spectrometer, the resulting average bias across the ensemble in XCO2 is 0.20ppm, while it is 0.8ppb for XCH4. As indicated by the executed long-term study on one device presented here, the remaining empirical calibration factor deduced for each individual instrument can be assumed constant over time. Therefore the application of these empirical factors is expected to further improve the EM27/SUN network conformity beyond the raw residual bias reported above.

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In a 3.5 year long study, the long term performance of a mobile EM27/SUN spectrometer, used for greenhouse gases observations, is checked with respect to a co-located reference spectrometer. We find that the EM27/SUN is stable on timescales of several years, qualifying it for permanent carbon cycle studies. The performance of an ensemble of 30 EM27/SUN spectrometers was also tested in the framework of the COllaborative Carbon Column Observing Network (COCCON) and found to be very uniform.
In a 3.5 year long study, the long term performance of a mobile EM27/SUN spectrometer, used for...
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